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通过引入基于结构广义刚度的构件重要性指标,提出了考虑构件重要程度差异的RC框架结构抗震优化设计方法。根据“构件重要性越大,承载力储备也越大”的结构系统设计策略,以构件的重要性程度由小到大逐渐发生损伤破坏的破坏模式为目标,根据现有一般构件的安全储备取值,建议了基于构件重要性指标的安全储备表达式。以广义结构刚度损失率作为结构失效判定依据,通过一RC框架结构抗震设计算例,分别对采用基于构件重要性指标方法和现行规范方法设计的结果进行对比,结果表明,建议方法的设计结果,其配筋分布更加合理,抗震性能得到显著改善,且总用钢量略有降低。
By introducing the importance index of components based on the generalized stiffness of structures, a method of seismic design optimization of RC frame structures considering the difference of importance of components is proposed. According to the structural system design strategy of “the greater the importance of components and the greater of the carrying capacity,” the structural system design strategy with the component importance decreasing gradually from small to large is considered as the target. Based on the safety of existing common components Reserve value, the proposed safety reserve expression based on component importance index. Taking the loss of stiffness of generalized structure as the basis of structural failure assessment, the RCA seismic design example is compared with the results of the design based on the component importance index method and the current standard method respectively. The results show that the proposed design method, The reinforcement distribution is more reasonable, the seismic performance is significantly improved, and the total amount of steel used is slightly reduced.